By William I. Orr, Stuart D. Cowan
This authoritative instruction manual covers the layout, building, deploy, and operation of fifty two vertical antennas.
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Obviously, mobile telephony could never become a mass market, could it? Similar thoughts must have occurred to the management of the inventor of cellular telephony, AT&T. 4 The analog systems paved the way for the wireless revolution. A. In the beginning of the 1980s, the phones were “portable,” but definitely not handheld. In most languages, they were just called “carphones,” because the battery and transmitter were stored in the trunk of the car and were too heavy to be carried around. But at the end of the 1980s, handheld phones with good speech quality and quite acceptable battery 3 Satellite communications – specifically by geostationary satellites – had already been suggested by science fiction writer Arthur C.
A small market for each standard), without the benefit of competition between operators. A. or Japan, would be impossible. It was thus logical to establish a single common standard for all of Europe. This decision proved to be beneficial for wireless communications in general, as it provided the economy of scales that decreased cost and thus increased the popularity of the new services. 5 New Wireless Systems and the Burst of the Bubble Though cellular communications defined the picture of wireless communications in the general population, a whole range of new services was introduced in the 1990s.
However, with a total of six speech channels for the whole city, the system soon met its limits. This motivated investigations of how the number of users could be increased, even though the allocated spectrum would remain limited. Researchers at AT&T’s Bell Labs found the answer: the cellular principle, where the geographical area is divided into cells; different cells might use the same frequencies. To this day, this principle forms the basis for the majority of wireless communications. 2 Marconi’s patents were actually overturned in the 1940s.